Title page for ETD etd-12192007-150550


Document Type Master's Dissertation
Author Curle, Ulyate Andries
Email ulyate.curle@up.ac.za
URN etd-12192007-150550
Document Title Near-threshold fatigue crack growth behaviour of mild steel in steam during rotating bending
Degree MEng (Metallurgical Engineering)
Department Materials Science and Metallurgical Engineering
Supervisor
Advisor Name Title
Prof G T van Rooyen Supervisor
Keywords
  • crack closure
  • envorinment
  • near-threshold crack propagation
  • steam
  • oxide-induced
  • rotating bending fatigue
Date 2007-04-24
Availability unrestricted
Abstract

The influences of a superheated steam environment and temperature on the nearthreshold crack growth behaviour of mild steel during rotating bending fatigue were investigated. A fatigue machine in which rotating bending is simulated was designed and built to allow continuous crack growth measurement. Experiments compared the threshold stress intensities (∆Kth ) for air at 24 C, air at 160 C and steam at 160 C.Air at 160 C yielded the lowest threshold stress intensity in both cases. Oxide thicknesses in the vicinity of the threshold were estimated from temper colours. The difference in threshold stress intensities can be explained by the concept of oxideinduced crack closure.

University of Pretoria

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